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<title>Creating a File Name Extension Filtering Rule</title>
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<h1 class="topictitle1">Creating a File Name Extension Filtering Rule</h1>
<div id="body0000001676473709"><p id="EN-US_TOPIC_0000002200876205__p10163346565">The system is preset with rules for filtering known ransomware file name extensions. These rules are associated with all file systems in the system by default. During file interception, the system checks whether the file name extensions in the file system are specified in the file name extension filtering rule. If yes, the system blocks the creation, opening, and renaming of the file system's files whose file name extensions are specified in file name extension filtering rule. You can create a file name extension filtering rule based on service requirements.</p>
<div class="section" id="EN-US_TOPIC_0000002200876205__section9646162911282"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_ol159217814715"><li id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001283108982_en-us_topic_0000001166366216_en-us_topic_0000001091431193_li1570821013536"><span>In the navigation pane, choose <span id="EN-US_TOPIC_0000002200876205__text0486163811356"><strong>Data Security</strong></span> &gt; <span id="EN-US_TOPIC_0000002200876205__text56981229133613"><strong>File Interception</strong></span>.</span></li><li id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_en-us_topic_0000001166366216_en-us_topic_0000001091431193_li12591123311535"><span>Go to the <span class="uicontrol" id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_uicontrol151981616171611"><b><span id="EN-US_TOPIC_0000002200876205__text18400753114114"><strong>File Name Extension Filtering Rule</strong></span></b></span> tab page and click <span class="uicontrol" id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_uicontrol17308229244"><b><span id="EN-US_TOPIC_0000002200876205__text4859152854719"><strong>Create</strong></span></b></span>.</span><p><p id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_p24069190226">The <span class="uicontrol" id="EN-US_TOPIC_0000002200876205__uicontrol18561195355016"><b><span id="EN-US_TOPIC_0000002200876205__text4561753185011"><strong>Create</strong></span></b></span> dialog box is displayed on the right.</p>
<p id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_p184581835143819"><span><img id="EN-US_TOPIC_0000002200876205__image15586164011522" src="en-us_image_0000002165355540.png"></span></p>
<p id="EN-US_TOPIC_0000002200876205__p12342338161314"></p>
</p></li><li id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_li1236704561811"><span>Set parameters of the file name extension filtering rule.</span><p><p id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_p4779111121910"><a href="#EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_table373910544193">Table 1</a> describes related parameters.</p>

<div class="tablenoborder"><a name="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_table373910544193"></a><a name="en-us_topic_0000001337156461_table373910544193"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_table373910544193" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameters of the file name extension filtering rule</caption><colgroup><col style="width:22.1%"><col style="width:77.9%"></colgroup><thead align="left"><tr id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_row9739135420196"><th align="left" class="cellrowborder" valign="top" width="22.1%" id="mcps1.3.2.2.3.2.2.2.3.1.1"><p id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_p673965415198">Parameter</p>
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<th align="left" class="cellrowborder" valign="top" width="77.9%" id="mcps1.3.2.2.3.2.2.2.3.1.2"><p id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_p6739125421915">Description</p>
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<tbody><tr id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_row47391054181917"><td class="cellrowborder" valign="top" width="22.1%" headers="mcps1.3.2.2.3.2.2.2.3.1.1 "><p id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_p27393548197">File Name Extensions to Be Intercepted</p>
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<td class="cellrowborder" valign="top" width="77.9%" headers="mcps1.3.2.2.3.2.2.2.3.1.2 "><p id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_p16739175417199">File name extensions to be intercepted. You can enter one or more file name extensions.</p>
<p id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_p35134612237">[Value range]</p>
<ul id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_ul19507182614253"><li id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_li165071226112512">The value contains 1 to 127 characters.</li><li id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_en-us_topic_0000001159963183_li18249801">A single file name extension can contain only digits, letters, spaces, and special characters (!"#$ %&amp; amp ;'()*+-./:;&amp; lt;=&amp;gt ;?@[\]^_`{|}~). The wildcard * must be the last character and cannot exist separately.</li><li id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_li1678595195014">Multiple file name extensions are separated by commas (,).</li></ul>
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</p></li><li id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_li5766134019479"><span>Click <span class="uicontrol" id="EN-US_TOPIC_0000002200876205__en-us_topic_0000001337156461_uicontrol6305372472"><b><span id="EN-US_TOPIC_0000002200876205__text10165101775317"><strong>OK</strong></span></b></span>.</span></li></ol>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0000002200876185.html">Configuring File Interception (Pre-event Interception)</a></div>
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